 Numberplay  The New York Times
Mathematical, logical and scientific puzzles, with solution "recaps." The posts, by Gary Antonick and Pradeep Mutalik, have included "Surreal Hat Tricks," "The Puzzles of Pickover," "Prime Rib at Hogwarts," "Nim for (a) Change," "Phi  The Magic and the
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 Number Puzzles  Ken and Dima Boone
Arithmetic puzzles along with hints and answers include "Laying Eggs," "Four Fours Into Seven," "Target Number 278," "Inserting Plus Signs," and "How Many Legs?" and "What's My Number?"
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 Numbersense Games  Hassan Baajour, Research Officer
Games for practicing clock time, counting, and more, developed at the London Knowledge Lab (LKL).
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 Number Strings  Imm, Kara; Lambert, Rachel; et al.
A place to find new strings, post strings, get feedback on design or number choice, and discuss the pedagogy of number strings, a classroom routine based on "sets of related math problems, crafted to support students to construct big ideas about mathematics
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 Number Time  BBC Learning
Learn about numbers and the number system by playing Shockwave games, printing out activities to do away from the computer, watching "Addem" star in fun cartoons that reinforce ideas of quantity; and listening to math songs, accompanied by animation.
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 numeracy  Adult Numeracy Network, Math Forum
A mailing list for those interested in the discussion of educational issues around adult mathematical literacy (ABE/GED/ESL, workplace, and literacy teachers, tutors, and adult learners), maintained by the Adult Numeracy Network (ANN). Read and search
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 Numeracy Helper  Educational Computing Support Services
The prime function of this website is to provide software to support teachers and students in the classroom or at home. There are over 75 free interactive online numeracy modules (Year 1 to year 9) with printable work sheets plus answer sheets. There
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 Numicon  Numicon, Ltd.
By representing numbers as shapes, Numicon's teaching program addresses different learning strengths with a multisensory approach. Download free mathematics display resources (for bulletin boards and the like); topics include Numicon shapes, pattern
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 Nummòlt  Maurici Carbó Jordi
Math teaching resources built by architects include base 10 block manipulatives; a block construction toybox; a logic construction toybox; an area workshop; and MathCats balance. See, in particular, Nummòlt's openended obbl & math toys: adding
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 NurtureMinds.com: Learn Mathematics with the Abacus  NurtureMinds.com
Distributors of the Learn Mathematics with the Abacus book series. Benefits of abacus work and mental mathematics discusses on the site; various packages of the texts for sale.
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 Olimpiada Matemática Española  C. SánchezRubio
Convocatoria XXXV Olimpiada (Curso 1998/99); Comisión de la Olimpiada Matemática Española; Información para alumnos y profesores; Problemas de las últimas Olimpiadas (Fase nacional); Material para preparación;
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 Omni Calculator  Piotr Malek
Freely offering calculator apps, as well as the code for calculators to customize and embed in your own website. Calculators for math applications include roots and exponents, percentages, proportions, distances in two and three dimensions, and several
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 One, Two.. Infinity  Marian Small
PDFs of presentations from the professional development consultant and author of Making Math Meaningful to Canadian Students K8, More Good Questions: Great Ways to Differentiate Secondary Mathematics Instruction (9  12), Eyes on Math: A Visual Approach
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 One Wolf Howls  Scotti Cohn, illustrated by Susan Detwiler
This children’s book uses the months of the year and the numbers 1 through 12 to introduce children to the behavior of wolves in natural settings. The site also offers free educational resources, including teaching activities, math quizzes, related websites,
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 On Four 4s and Speed Limits (Math Chat)  Frank Morgan; Christian Science Monitor
Can you get past 30 in forming numbers 0, 1, 2, 3, ... from four 4s and the standard mathematical operations +,  , x, /, decimal point, square root, powers, and factorial(!)?
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 Online Catalog  Creative Publications
Educational publishers of MathLand (K6) and Mathscape (68) curricula, supplemental resources, and manipulatives. Teachers' lounge, professional development information, workshops and conferences, and product and ordering information.
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 OnlineCollegePrep.com  Robert Hackworth
Distance learning courses in reading, writing, math, and study skills. A free online arithmetic course is available for adults needing help to prepare for precollege and collegelevel math instruction. A real instructor instructs and leads the course.
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 Online games and activities at Syvum  Syvum Technologies, Inc.
Online activities for practicing practice addition, subtraction, multiplication, division, fractions, algebra, and word problems. Workbooktype activities are interactive, with automatic generation of tests, immediate grading, and a new set of problems
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 Onlineindiaeducation  Atul Mittal
Page after page of questions with links to view answers and explanations: aptitude (area, series, "problems on trains," boats and streams, odd man out, and more), puzzles (sudoku, number, logical, clock, etc.), and reasoning (cause and effect, arithmetic,
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 Online Math Calculator
This collection of free online calculators includes a scientific calculator that accepts inputs of entire matrices and equations, calculates derivatives, and plots functions. Onebutton unit conversion calculators convert between Celsius and Fahrenheit,
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 Online Math Calculator  Tom Flowers, Mintmark.com
A free Webbased math tool: simple calculator with inverse and exponent functions and the four trig functions.
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 Online Math Games  Ramona Pasca
Free Flash 6 math games and worksheets.
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 Online Math Help for All  Ramachandran Seerangan
Primers and problems, a math dictionary, worksheets organized by grade and concept, and more. See in particular Seerangan's YouTube channel, where he posts narrated whiteboard videos of stepbystep solutions to specific problems.
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 Online Math Help & Learning Resources
Learn basic concepts behind arithmetic, algebra, geometry, statistics and set theory. Includes some SAT test preparation help, math games, math worksheets, math riddles, math quotes, math mnemonics and math trivia.
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 Online Tutor: Math, Science, Computers, Etc.  Morris Roth
Online tutoring in math, physics, chemistry, biology, computer languages, English, and French. Inperson tutoring in Tulsa, OK.
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 .oO worksheeps  Felix Heckert
Generate worksheets of customized math exercises, complete with solutions: basic operations with integers, negatives, and fractions; binomial and quadratic formulas; partial roots; percent calculation; curve sketching; metric; derivations; antiderivatives;
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 OpenEnded Assessment in Math  Cooney, Thomas J.; Sanchez, Wendy B.; Leatham, Keith; and Mewborn, Denise S.
Over 450 openended, fieldtested assessment items, distributed more or less equally among elementary, middle school, and high school grade levels. The questions relate to five major content areas, based on the NCTM Standards: number and operation; probability
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 Open Middle  Johnson, Nanette; and Kaplinsky, Robert
"Open middle" problems, hints, and answers, all aligned to the Common Core State Standards (CCSS). Introduced by Dan Meyer, these kinds of math challenges have a "closed beginning," meaning that they all start with the same initial problem; a "closed
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 OPenn  University of Pennsylvania Libraries
Highresolution archival images of manuscripts from the University of Pennsylvania Libraries and other institutions, along with machinereadable descriptions and technical metadata. Digitized cultural heritage materials on mathematics include "Treatise
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 Optical Data School Media
A publisher of math and science programs, including Windows on Math, an activitybased laserdisc and videotape curriculum built around the NCTM standards. Most products are for levels K8. Find Correlations for Optical Data products to a wide range of
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 The Pai Intersect  Jimmy Pai
Blog by an Ottawa (Canada) secondary mathematics teacher and graduate student in education. Posts, which date back to August, 2012, have included "Understanding Fraction Division #2  Part 1," "$100 Tablet Project," "Spiraling through the curriculum,"
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 Panthera's Puzzle Contest  Dr. Amy Galitzer; Puzzle University
A weekly contest of math, logic, and word puzzles sponsored by the American Mathematical Society and the University of Maryland Mathematics Department. You can submit your own puzzle for the next contest by signing up to participate, or simply read the
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 Paso Partners: Integrating Mathematics, Science, and Language  Southwest Educational Development Laboratory (SEDL)
A twovolume curriculum and resources guide for K3 educators, designed to help teachers increase achievement of Hispanic children whose first language is not English. Preceding each complete unit in English is a Spanish version of background information
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 Passy's World of Mathematics
Lesson outlines by this Australianborn math teacher include Venn diagram word problems, combining like terms, translate word equations, and isometric drawing and 3d cubes; PowerPoint presentations include traversable networks, sharing using ratios, real
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 Pat Kenschaft's Home Page  Patricia Clark Kenschaft, Department of Mathematical Sciences, Montclair State University
From the host of the weekly callin talk radio show, Math Medley (19982004): links to her books, such as Mathematics for Human Suvival, Winning Women into Mathematics, and Math Power: How to Help Your Child Love Math Even If You Don't, the first book
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 PBS Teachers: Math  PBS Teachers
The Public Broadcasting System's Math Service, combining computing and telecommunications technologies to offer interactive data services and interactive video and voice services for education based on the NCTM Standards. The site features: resources,
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 PC Calc
Calculator program for Windows 2000/XP. Offers calculations, graphing, matrices, steps in solving equations, and more. Features listed and a free 30day demo is available on the site.
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 PCTM Online Puzzle of the Week  Judy Brown; Pennsylvania Council of Teachers of Mathematics
Weekly illustrated math puzzle online competition from 199697, with an archive of past puzzles. Since 1997 this project has moved to the Math Forum to become its Middle School Problem of the Week.
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 Pédagogie  Olivier Batteux
MathsRix et Labymath sont des logiciels présenté sous forme de labyrinthe où il faut choisir des portes qui correspondent à des choix opératoires en vue des résoudre des problèmes concrets. Découvre
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 Peter Ash's Thoughts on Math and Education  Peter Ash
Musings on doing and teaching mathematics, book reviews, and math problems both elementary and advanced from the creator of Cambridge Math Learning. Blog posts, which date back to August of 2007, include "Very Proper Fractions"; "Physical Models for NonEuclidean
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 PhotoMath  microblink
"Smart camera calculator" apps that use a cell phone's builtin camera to read mathematical expressions in real time, then output stepbystep solutions.
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 Physicscatalyst
Study notes, videos, formula sheets, solved examples, solutions from India's National Council of Educational Research and Training (NCERT), and more for middle and high school maths.
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 PianoMath Home Page: Improving Math Skills through Music  Peter Taussig, E. Paul Goldenberg
Essays and activities on links between music and mathematics. PianoMath is
a crossdisciplinary curriculum of musical classroom activities relating to
arithmetic, geometry, graphing, logic foundation, and prealgebra. It is
now being tested at an elementary
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 The PiFactory  David Whitfield
Revision notes, boardshots, and Excel worksheets to download, from when the author used to teach in North London. The PiFactory includes an opensource assessment suite, classroom resources, and concept maps. The PiFactory conveniently pulls together
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 The Pixel Calculator  METIP (Mathematics Experiences Through Image Processing) Project
The Pixel Calculator is intended primarily for use by students of ages 1217 in a variety of enrichment activities involving mathematics and digital image processing. It provides a good introduction for students to digital images by allowing students
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 Place Value  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How do I provide my students with practice on their place value skills?
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 Planetcalc  Anton Egoshin
More than a hundred free calculators on math topics ranging from area of a triangle by its coordinates to total squares (the number of squares in given rectangles). Categories of others include date and time, health, computers, engineering, finance, navigation,
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 PlaytoLearn.com  Fenzi Designs
These flash cards and other tools help students in grades K5 learn the basics of math, tell time, count money, add, subtract, multiply and divide.
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 Play With Your Math  Kelly, JOEY; and Yu, Xi
Biweekly math problems that "require you to try, fail, and adjust many times before finding a solution." Each short, provocative question comes illustrated and ready to print out in large type on 33" × 40" dimensions: Space Race, Star Polygons,
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 PNC Grow Up Great  The PNC Financial Services Group, Inc.
Bilingual tips, activities, and videos of this corporate philanthropy's school readiness initiative aimed at preparing children from birth to age five for success in school and life. In particular, download a children's story that shows "math is everywhere,"
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